propionyl l carnitine powder Swanson L-Carnitine 515mg + Glycine 60 Veggie Caps Glycine propionyl-L-carnitine - Wikipedia

ButyroGen is a registered trademark of NutriScience Innovations, LLC for their tributyrin complex

These creams and ointments, available both over the counter and through prescription, often contain active ingredients such as: Vitamin C Kojic acid Glycolic acid Retinoids Azelaic acid Hydroquinone (prescription-only) Arbutin (a gentler alternative to hydroquinone) Many of these ingredients work by inhibiting tyrosinase, the enzyme responsible for melanin production, thereby slowing pigmentation and promoting a brighter complexion

PMC 4487230

Then for the last resort, corticosteroid injections may be considered, and thats really only if visible swelling is present