If you have at least a week to get rid of those tan lines, buy yourself a gradual self tanner lotion. These gradual formulas which darken over the course of several days (instead of hours) are the most foolproof, natural looking way to clear up your tan lines. Jergens is a great gradual formula. If you don't have days, opt for St. Tropez and paint the lotion heavily onto your tan lines being as meticulous as possible. Leave overnight and then shower it off.
Try this: Jergens Natural Glow (Shop Now)
Try this: Clarins Self Tanning Milky Lotion for Face and Body (Shop Now)
Try this: St. Tropez 'Self Tan' Classic Bronzing Lotion (Shop Now)
Make sure your skin is clean and thoroughly exfoliated by using a loofah or washcloth and a good body scrub. Doing this daily will also help fade your unfortunate tan quicker. When you skin is really dry, then go back in and apply a moisturizer. Worth noting - repeat the exfoliate, lotion routine daily until tan lines are not noticeable. But make sure to only exfoliate the too-dark areas, or you'll be undoing your work.
Try this: Glytone Exfoliating Body Wash (Shop Now)
Try this: Herbivore Coco Rose Coconut Oil Body Polish (Shop Now)
Try this: Caudalie Crushed Cabernet Scrub (Shop Now)
Try this: Kiehl's Gentle Exfoliating Body Scrub (Shop Now)
Mix a liquid bronzer with your daily body moisturizer and smooth it over the pale area to help further blend away your tan lines. Make sure to set it with a dusting of powder bronzer or translucent powder. Finish it off with a spritz of makeup setting spray.
Try this: Per-fekt Beauty Skin Perfection Gel, in Decadent (Shop Now)
Try this: Benefit Cosmetics Hoola Zero Tanlines Allover Body Bronzer (Shop Now)
Try this: Urban Decay All Nighter Long-Lasting Makeup Setting Spray (Shop Now)
You know that the existing tan lines are due to sun exposure. If you go out in the sun again without the proper use of sunscreen, it will only worsen the situation and make you tanner. Make sunscreen part of your daily routine because protecting yourself from both UVA and UVB rays indirectly helps get rid of your tan lines.
Try this: La Roche- Posay Anthelios 60 Clear Skin Dry Sunscreen (Shop Now)
Try this: Dermalogica PowerBright TRx Pure Light SPF 50 (Shop Now)
Try this: Glossier Invisible Shield Daily Sunscreen (Shop Now)