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Genital Blisters, Genital Warts and Genital Ulcers – Causes & Treatments

Genital blisters, genital warts, genital ulcers – more common than you think but invariably exceedingly distressing for the person suffering from them. Today we talk a little about the various causes for the above genital skin conditions.

Genital lumps, bumps and sores can be an alarming phenomenon for anyone. One day you notice a tiny little bump, or perhaps several bumps.

Now you’re not sure when they appeared – was your skin normal last week, or did you just never notice the bumps for a good duration? Or perhaps you notice what you thought was a little pimple or an ingrown hair follicle which happens from time to time because you shave. But now it’s burst, leaving a painful raw ulcer.

What are the Causes of Genital Blisters, Genital Warts and Genital Ulcers?

1) What are the Causes of Genital Blisters?

Genital blisters are small, fluid-filled bumps and can occur anywhere over the genital region.

a) Genital Herpes

One of the classic causes of genital blisters is genital Herpes, caused by the Herpes Simplex Virus.

Here’s a video about Herpes

Genital herpes has Several Stages:

Stage 1: Prodrome – the skin appears normal but you may feel an unusual sensation like a tingling or itching. This indicates that the virus is active and heralds an impending outbreak

Stage 2: Redness – you may notice some nonspecific red spots which may be uncomfortable or slightly painful.

Stage 3: Blisters – this is usually when people realise something is not right, Initially, these may resemble tiny pimples. They then grow in size and become fluid-filled and painful.

Stage 4: Ulcers – the blisters burst, leaving shallow, painful ulcers

Stage 5: Scabbing or crusting – a scab or crust forms over the ulcer, which eventually heals

Also, check out What is Oral Herpes & Cold Sore

b) Balanitis

In males, balanitis may sometimes present with tiny blisters. The term “balanitis” is a descriptive term which means inflammation of the head of the penis and foreskin. This usually manifests as skin redness, with some tiny blisters or whitish bumps, as well as possible itching/pain or discomfort.

There can be multiple causes of balanitis. The skin on the penis is no different from skin elsewhere on your body and redness, discomfort and irritation can be caused by many factors:

  • Infections such as fungal skin infections
  • Skin irritation caused by external factors like soaps (irritant or contact dermatitis)
  • Mechanical trauma in the form of excessive friction e.g. masturbation or sexual intercourse with insufficient lubrication
  • Poor hygiene
  • Sensitive skin e.g. in people prone to eczema or dry skin

Depending on the possible underlying trigger or cause, various topical creams may be useful. In some cases, skin swab tests or urine tests may be useful in checking for underlying infections.

Read more about What is a Penile Infection?

2) What are the Causes of Genital Warts?

a) Human Papilloma Virus

This is THE cause of genital warts. Genital warts are skin coloured, fleshy bumps which may occur singly or in clusters around the genital and anal region. They can range from tiny firm bumps to larger, irregular shaped bumps which are classically described as “cauliflower-like” in appearance.

The Human Papilloma Virus (HPV) is a sexually transmitted viral infection. There are many strains of HPV and they are transmitted through sexual contact. Some strains are responsible for genital warts, while other “high risk” strains can lead to an increased risk of cancers such as cervical, oral and anal cancers.

If you have warts, it effectively means you have been infected by at least one strain of HPV. If you are female and you are not already doing your regular PAP smear for cervical cancer, you should do a PAP smear with high risk HPV testing because an individual may have not just one but several strains of HPV. You can read more about PAP smears and cervical cancer screening.

There are various methods available for the treatment of genital warts, ranging from topical medications to freezing or cryosurgery electrosurgery. But one must be prepared that warts can unfortunately recur as the treatment for warts addresses the effects of a HPV infection but does not clear the virus from your body.

The best defence we have against genital warts is the HPV vaccine – Gardasil 9, which provides immunity against certain wart causing strains of HPV.

3) What are the Causes of Genital Ulcers?

When people think of genital ulcers, often the first few causes that spring to mind may be herpes or syphilis. However, genital ulcers can be due to other infections as well as rarer, non-infective causes such as autoimmune diseases.

This is why various tests are useful in differentiating the causes of genital ulcers. The treatment of choice varies drastically depending on what the underlying cause is.

Caused by Sexually transmitted infections (STIs)

  • Herpes Simplex Virus (Common)
  • Syphilis (Common)
  • Chancroid (Rare)
  • LGV (Rare)
  • Donovanosis (Rare)

Non-infective causes

  • Behcet’s (Autoimmune)
  • Crohn’s disease (Autoimmune)
  • Fixed drug eruption (rare causes)
  • Skin Cancer (rare causes)

a) Herpes Simplex Virus

(Painful shallow ulcers and blisters)

As mentioned earlier, both genital blisters and ulcers are different stages of a herpetic flare. A genital skin swab test for the presence of HSV DNA is helpful in confirming HSV as the cause of genital ulcers.

b) Syphilis

(Painless ulcers)

Syphilis can cause ulcers both during its primary and secondary stages.  A chancre, a painless round ulcer, occurs in primary syphilis, while in secondary syphilis, multiple painless ulcers may occur as well. One of the defining traits of a syphilitic ulcer is its painlessness.

These ulcers may be accompanied by other symptoms such as a rash elsewhere on the body.

C) Chancroid

(Multiple painful deep ulcers and swollen groin lymph nodes)

Genital Blisters

Chancroid is a painful ulcer which is frequently associated with enlarged and painful inguinal (groin) lymph nodes. These are located along your underwear line and may be felt as tender swollen lumps. There are usually several or multiple deep and painful ulcers.

This is caused by a bacterium called Hemophilus ducreyi, which is transmitted through sexual contact. Painful lymph nodes and negative test results for both Herpes and syphilis support this diagnosis. The good news is that antibiotic treatment can clear this up.

Lymphogranuloma venereum (LGV)

Small ulcer, swollen groin lymph nodes, possible rectal pain

Lymphogranuloma venereum (LGV) is an uncommon cause of genital ulcers. It is caused by the bacterium called Chlamydia trachomatis (serovars L1-3). This Chlamydia is different from the “subtype” of Chlamydia trachomat is that causes the common STD you are thinking about. A Rapid Chlamydia & Gonorrhoea PCR test will be about to detect the infection.

The ulcer it causes tends to be small and often goes unnoticed. The lymph node swelling is dramatic and painful and may even discharge pus.

If this was acquired through anal intercourse, inflammation of the anal and rectal canal (known as “proctitis”) can occur, causing rectal pain, bleeding and discharge and diarrhoea.

Donovanosis

Shallow beefy looking ulcers

This is again a rare cause of genital ulcers in the developed world. It is caused by a bacterium called Klebsiella granulomatis and causes shallow ulcers which may bleed easily. This is usually diagnosed with a punch biopsy, which is when a sample of skin tissue is removed for evaluation in the lab.

Other rare causes:

Autoimmune or inflammatory causes, skin cancers, drug reactions

“Autoimmune” diseases occur when your body’s immune system has a tendency to attack itself and one of the many manifestations can be genital ulcers. These are rare and treatment is by a specialist doctor. These ulcers will go away only with good control of the underlying disease.

Sometimes, a bad reaction to a certain medication may cause a persistent, painful ulcer.

Very rarely, genital ulcers may be due to cancer.

All in All

The good news is that most of the abovementioned causes for genital blisters, warts and ulcers can be treated. But an even better step would be to protect yourself from even developing these – safe sexual practices (using barrier protection, doing your regular sexual health screening, and getting the HPV vaccine) are your best bet against these.

Take Care!


  1. HPV Infection & HPV Vaccination for Men who have sex with Men
  2. Do I Have HIV Rash? Or Are They Other STD-Related Rashes?
  3. How Late Can a Period Be (Delayed Menstrual Cycle)
  4. What are the Causes of Abnormal Penile Discharge?
  5. STD Risk for Receptive Unprotected Anal Sex in Men
  6. Low HIV Risk Doesn’t Mean No HIV Risk
  7. HIV PrEP for Travel – How You Need to Know
  8. An Overview on STD from an STD Doctor
  9. Everything You Need to Know about Herpes Simplex Virus
  10. How Do I Treat Oral Herpes (Cold Sores)
  11. Syphilis Symptoms – Painless Sore & Ulcers
  12. HIV Symptoms – What You Need to Know
  13. 10 Common HIV related to Opportunistic Infections

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