SPF & Hydroquinone: After the pimple goes away, it can leave a blemish called pih (post inflammatory hyperpigmentation.) the inflammation causes the pigment cells to make too much pigment. Sun exposure can make it worse, so a good physical uv sunblock will helps it from getting darker. A skin lightener would be needed to fade the pigment. Hydroquinone 4% is known to work, but requires a prescription.
Answered 11/13/2015
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