labia coloring

is my labia normal?

i’m 25 and have taken bc pills in the past, for a long while now i’ve had this big brown patch on one labia. honestly never thought much of it until this past year when i went through terrible health anxiety/hypochondria episode. now i question everything. i’ve seen my gyno and a derm neither are concerned but my derm offered to biopsy if it’s something i want but it would be so painful. i think it’s just vulvar melanosis and have literally only found one picture of a labia that looks similar to mine. the pigment takes up almost all of my left outer labia lip. does anyone else have this? should add im white and the rest of my labia is pink. i have a history of many atypical miles.