Hello and thanks for your query.
I shall make an effort to provide you with good professional recommendations specific to your questions.
Bars on the information provided by you it appears to be some
allergy to some substance that you might have come in contact with.
You can soothe irritated skin with a cool soak. Water can wash away any remaining allergens and help inflamed tissues to shrink back to their normal size. Wearing breathable fabrics like cotton might also be helpful, as the inflamed skin might need to breathe in order to heal. You can apply any over the counter penis health cream.
Itching over other areas can be addressed by keeping the areas dry and either using over the counter antihistamine cream or taking oral antihistamine medication.
If it persists after few days or it intensifies, I advice you to see doctor for examination and further treatment.
Yet again, I duly appreciate your query to me, I do hope that have found something useful to help you and I shall be glad to answer any further apprehensions.
Sincerely,