After reading your Text, i understood that most probably it is Urticaria (wheals).
Photo helps in correct diagnosis.
RedPimples inside and outside needs to see, what are they.
28 yr old, male, Marrital status, sexual exposure history needs to be clear.
Next Steps
take Tablet Atarax 25 mg, in night fur Itching.
Colosoft AF lotion over elbow, stomach, thigh.
penis lesions needs to be checked.
Health Tips
Itching can be reduced with medicine.
proper diagnosis (needs to look at the lesion) will solve your problem.