How old are you? Do you spend a lot of time in the sun? Have you had skin cancer in the past?

I dont mean to freak you out but you should always see your doctor when a mole or freckle changes and appears out of no where.

I am 15, i spend a lot of time outside playing tennis in the spring summer and fall. Should I ask my dermatologist about it?

i had a freckle appear on my lip about a year ago, it made me pissed and freaked out, and it was because I was outside so long at that time and got a lot of sun exposure.

but here's the good news, it eventually went away completely.

in the mean time, always wear lip chap with sunblock, the lips have no melanin like the skin, so they get damaged very easily.