Any alpha or beta hydroxy acids (salicyclic acid, lactic acid, etc) are great for softening the skin. Even acetic acid (vinegar) is great, but it smells. I made a post on vinegar a while back. Definitely keep the acid you are using away from the tip of the penis! It won’t cause damage but will burn. I would recommend products with salicylic acids over other acids because it is lipid soluble and may penetrate deeper than the other water soluble acids. I really don’t know how much it matters though.
I’m a PA in dermatology, but don’t have alot of people coming in with PE induced hyperpigmentation issues. I would certainly recommend AmLactin or a salicyclic acid topical if they did. I don’t even know if the acids can actually help all that much as the discoloration is in the dermis and not the epidermis, which is what the lotions and acids predominantly affect, but they do make your skin nice and soft and may stimulate the dermis to speed up operations and increase blood flow. I’ve had some clamping induced pigmentation myself and the best thing to do is just stop clamping and it should go away on it’s own. It may take several months but topicals may speed the process a bit. It really isn’t possible to prevent or minimize the hyperpigmentation if you are actively clamping. The high pressure in your vessels causes leaking and deposition of hemosiderin, which takes some time to be processed away.
Also, someone mentioned using steroids…
Diprosalic contains betamethasone dipropionate which is a VERY potented steroid. This should not be used on your penis, scrotum, or groin unless specifically directed by a healthcare practicioner. Side effects of inapproriate use can lead to permanent atrophy of the skin. Generally, only low potency steroids are used on the genitals.