Welcome to HCM.
Itching of the buttock, bumps and sores over buttock and genitals, Possibility of Genital Scabies
If you tell more about your sexual activity and age, that will give more information.
Pictures of the lesions will help more to arrive at a diagnosis. Meanwhile it is important to have a blood check up for STDs/HIV
, as your present lesions may be a marker for other disease also.
Consult your Physician/ Dermatologist
as early as possible and get cured fast.