Thanks for writing to us.
These red itchy bumps on genitals are due to scabies. This variant of scabies is known as nodular scabies.
Firstly scabies infestation should be treated with permethrin cream
application and ivermectin
pill. The nodules are treated with application of steroid cream . The nodules and itching are due to hypersensitivity
reaction to the mite. Use of antihistamine like cetirizine
and steroid cream application would help
Hope that helped