Hi,
You probably have ecchymotic patch with mole and crusted lesion on the knee.
This much description is less to come to conclusion.
Therefore, I would like to ask few questions.
Do you have itching, burning or pain in lesion?
Do you have Fever,body ache or joint pain?
Duration of the disease?
Past history of same or other disease?
Family history of disease?
Any habit of alcohol or smoking?
Did contact any doctor?
Did you take or apply any medicine?
Any blood test?
Please answer above questions.
I would like to have close up photograph of the lesion. You have a feature to upload the images by yourself on the right side of this query page. Please utilize it.

Thanks..

Dr. Ilyas Patel MD

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Hi,
Welcome back.
I have seen your photograph.
It seems that you are having localised vascultis.
Vasculitis is inflammation of blood vessels in the skin which leads to erythema,purpura and necrotic ulcer. There are many causes. Infection,drugs,connective tissue diseases,trauma, insect bite,neoplasia..etc

In your case, vasculitis may be due to infection or insect bite.

You take short course of antibiotics along with steroid in tapering dose.
..Additionally, for localized or limited disease, antihistamines, colchicine, or dapsone along with supportive care as well may be useful.

You do leg elevation and compression of lesions may also be helpful.

You may apply antibiotic cream locally.

All this you should do under observation of dermatologist.

I hope you might be satisfied with my answer.

Still, if you have query, you may ask me. Otherwise, please close the discussion..thanks

Dr. Ilyas Patel MD

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