<s>[INST] HI I have some white patches on my penis.It is very itchy and when I rub ,it comes out like flakes(like large dandruff) but after that the area becomes red and starts burning.If water drops on it ,then it burns like an acid drop.The patches are even found in my calf muscle,forearms and sometimes in head (very minor) I am not sure...this is fungal or somethin else...Please advise [/INST] Hi, It may be scaly dermatitis most probably psoriasis vulgarism. It is an autoimmune skin condition of unknown cause. Stress may be the factor to exacerbate the condition. Consult the dermatologist and get thorough examination and investigations to get perfect management. A keratolytic ointment containing salicylic acid may be applied on the scaly patches on extremities and mild steroid cream on penile skin may be considered. There are many oral treatment modalities also. Coal tar-containing shampoo may be used to cleanse the scalp. All the treatment should be taken under observation of the dermatologist.  Hope I have answered your query. Let me know if I can assist you further.  </s>