1. This is probably post inflammatory hyper pigmentation which is a normal reaction of the skin in response to infection where melanocytes migrate into the healing area giving skin a darker appearance.
2. The best way to speed healing is to promote general health of your skin by applying a good sun screen when out in the sun and use a good skin moisturizer. [ This can, however, require weeks to months to show effect]
3. Consult with A Dermatologist
regarding use of topical steroid
creams, as steroid creams can cause thinning of the skin of the face if applied for too long . Chemical peels
and bleaching creams, are commonly used.
4. Discuss the Option of Q switched Nd YAG laser
with your dermatologist.