I don’t think it is bad to cover it with a Band-Aid but I don’t see why you’re doing that unless your clothes are irritating it as you suggest. Usually, herpes lesions do not scar but in people of color, the pigment can be gone for a while. I have also seen scarring on the buttocks of people who get buttocks lesions. I don’t have any great ideas about how to get the redness to go away but I think there are some products on the market that deal with scars if you think that might be what’s going on here. You should check them out.