u/DoctorDweeb

The user's cursed energy takes the property of liquid acid, capable of causing visible destruction to living tissue and materials upon contact

This damage can be healed from by RCT, however, traces of corrosive cursed energy can stick to skin, resulting in constant damage despite healing that can only be stopped if the user clears the acid.

The user is immune to their own acid

Pros:

Passive offense and defense boost - Hitting your opponent with acid coated fists sucks for them, and being hit when you can reinforce your own body with acid also sucks for your opponent, you're a walking corrosive.

Environmental degradation - The strength of the acid can easily melt through walls, floors and weapons, allowing the user to setup traps in the floor, melt through walls to chase a target, or disarming the opponent by melting their weapon.

Cons:

Short range - The acid needs to physically touch an opponent, forcing the user into close melee range which can be dangerous, and ranged fighters can zone the user away from melee distance.

Risk of friendly fire - The acid does not discriminate, and can accidentally harm an ally if caught in the crossfire.