Upper lip pigmentation has multiple causes. Sometimes it is caused by bruising from plucking hair out with tweezers. This is only temporary and easy to remove. Another cause is dryness or discolouration from waxing. This problem is persistent but treatable. Finally, it's possible that people with discoloured upper lip pigmentation have a condition called "Melasma" which needs professional treatment. Try these home remedies to determine the condition of your skin. Home remedies are much less costly than heading to a dermatologist.
If you pluck your upper lip hair, it's possible that you caused bruising to your skin. Stop plucking your hair. Change to waxing or threading because these don't pull at the hair in the same way. Discolouration is temporary in this case. If the discolouration makes you uncomfortable, apply a light cream bleach. Paint it on with a brush and let it sit for the prescribed time on the label. Wash it off with water and a wash cloth.
Waxing sometimes dries out the skin above the lip or causes discolouration. If you use this method and find you need to remove pigmentation, a homemade remedy is best. Use lemon or cucumber juice; wipe it on the skin and let it sit for 10 minutes. Do this daily. Also apply honey and let it sit for about 10 minutes. This moisturises and calms the skin above the lip.
If you notice that the problem is persistent despite using bleach or other remedies, you need to visit a dermatologist. These doctors specialise in skin and prescribe medicine for skin issues. Melasma is a common skin condition found mostly in women with darker skin tones. It is caused by the hormone oestrogen which triggers the development of pigmentation when exposed to the sun. Dermatologists use a test called the "Wood's Lamp Test" to diagnose the condition. Treatments include topical creams, laser treatment and special facial peels.