Thanks for writing to us.
Firstly you have to understand every disease is not AIDS or cancer. AIDS has systemic manifestations too like weight loss
, fever, generalised lymphadenopathy
, diarrhoea etc.
From the description it seems, it could be vitiligo or pityriasis
versicolor or lesions of post inflammatory hypopigmentation
A consultation with doctor nearby is must to diagnose the condition and provide appropriate treatment. You may also use ASK A SPECIALIST feature of this website to upload an image of concerned area and get a personalised treatment plan.