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Geographic Tongue If dry white patches form weird shapes on your tongue, similar to the outlines of states on a map, that could be a sign of celiac disease, an autoimmune disorder that causes your body to attack itself when you ingest gluten. If you're also experiencing diarrhea, fatigue, vomiting, or weight loss, don't disregard your funky-looking tongue, warns an Italian study on celiac disease.
Lumps Under Your Skin Firm bumps or "nodules" under your skin may be the first symptom of rheumatoid arthritis, suggests a study from the journal Dermatology. These lumps—which are composed of tissue and can grow to the size of walnuts—tend to show up close to your joints, especially in your hands and near your elbows. Fortunately, they usually don't hurt.
Gnarly Nails If your nails have little white nicks and gouges—almost like an icy surface that's been scraped up—those "pits" may be a sign of the skin disease psoriasis. While you probably think of skin rashes and irritation when you think of psoriasis, pitted nails affect between 80% and 90% of patients with the condition, concludes a study from Dermatology Research and Practice. In fact, some people experience nail issues before there’s any sign of a skin problem, the study authors say.