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Hi, this is Dr Ansari, welcome to JA
There are several reasons that would cause a rash to appear on the testicles sac, inner thighs and the penile shaft. Common causes of these rash will include STDs, candidiasis, heat rash, dermatitis, eczema, and scabies among many other causes.
May I know, do you have such lesions else where in body with sliver scaly leissions?
This lesion does itch or not?
Have done done tests for STD
Is it itching?
The history of the same type of rash on the back, thigh and stomach giving the impression of Scrotal psoriasis.
The diagnosis of psoriasis is usually made by its clinical appearance, with symmetrical, circumscribed erythematous plaques. Consult Dermatologist may need a biopsy
You can use psoriasis cream under the direction with dermatologist
only external as other parts already no rashes.
Please remember first to apply a little area and see how it responds as you may have a burning sensation or allergy to it . In that case, don't use and contact your GP.
Put olive oil as well.