Hello,
Without examination confirming a diagnosis is very tough but the various possibilities are contact dermatitis,sweat dermatitis,
eczema,psoriasis and Lichen sclerosis and balanitis xerotica obliterans.It doesn’t sound like herpes.
Eczema is a form of chronic dermatitis (rash) and can cause dryness of the skin and rashes.Allergic reaction is one of the important causes of eczema. Lichen sclerosis appears as white,dry plaques on the glans, foreskin or shaft of the penis.