Red/Purple Marks Above Lip After Face Peel: Is This a Chemical Burn?

The agents your are describing can irritate the skin and cause a chemical burn.  This may cause scaring.  I would encourage her to be seen by a board certified dermatologist who can evaluate the severity of the reaction and treatment accordingly.  Please keep in mind that it is possible to purchase products that are not safe and this can cause unanticipated harm.  Hopeful with the right care your friend will heal without a scar.

Redness, and possibly purple discoloration may result from a burn, but ,after all, chemical peels work by burning. Light peels should only burn very superficially, like a mild sun burn. If the skin blisters,for example, the peel has gone deeper, but the skin should recover.  If a yellow,dead color is achieved, it has gone way too deep and will scar.  Skin type is  very important when it comes to peels. The more pigmented the skin is, the more likely you are to induce permanent color changes. If your friend's peel is recent, it may be OK in a few weeks. You should be aware that the skin of the lip is particularly sensitive to burning.