skin darkening causes

There are several potential causes for skin darkening, and it’s understandable you’d want to know more. You’ve mentioned sun exposure, which is a common cause, but since you’ve been diligent with sunscreen, let’s explore other possibilities. Hormonal changes can indeed lead to conditions like melasma, which causes brown or gray-brown patches, often on the face. These changes can occur during pregnancy, or with oral contraceptives and hormone therapy. Melasma is often symmetrical, and sunlight can exacerbate it, even with sunscreen use. Stress, while not a direct cause of darkening, can worsen underlying skin conditions through changes in hormone levels. You may also want to consider other dermatological conditions like post-inflammatory hyperpigmentation (PIH), which results after an injury or inflammation like acne subsides. This leads to residual dark patches, often seen more in individuals with darker skin tones. It’s unlikely your diet alone would cause skin darkening, although a deficiency in certain nutrients like vitamin B12 or a condition like hemochromatosis (which might not always turn up in standard blood tests) can cause pigmentation changes. If new medications aren’t a factor, reviewing chronic medications is another step. If topical creams or products have changed recently, consider any irritants or allergens. Since blood tests were normal, more narrowed dermatological testing might be needed. Importantly, make an appointment with a dermatologist for a comprehensive evaluation, including professional guidance on potential biopsies or a woods lamp examination. Treatment such as topical creams containing hydroquinone, tretinoin, or others could be pertinent based on the diagnosis. In the meantime, continue protecting your skin with sunscreen and consider physical barriers like wide-brimmed hats.