Diva extraordinaire ∙ 41 weeks ago
Any time you injure or irritate your skin (whether it's from acne, over-scrubbing, or using harsh products), a darker pigment will appear. These dark spots form as part of the skin's healing process, and are known as post-inflammatory hyperpigmentation or PIH. The dark area will worsen if you pick or pop your skin.
And surface irritation isn't limited to your face. Ever nick yourself shaving? The small cuts, rashes, and ingrown hairs that appear as the result of daily razor use -- especially in the underarm area -- can also cause a darkened skin tone.