Thanks for writing to us.
Sometimes we are not able to diagnose a skin condition unless we see it. However, lesions over forearms and scalp could be due to psoriasis, lichen planus
or seborrheic dermatitis
. these three can easily be differentiated by clinical examination. I would advise that you meet a dermatologist
to get the lesions diGnosed and treated.
In the meanwhile use a steroid cream over forearm lesions and ketoconazole
tar based shampoo over scalp.
Hope this helped.