Sarcoidosis may affect your lymph nodes. The disease can cause enlarged lymph nodes that feel tender. Sarcoidosis usually affects the lymph nodes in your neck and chest. However, the disease also may affect the lymph nodes under your chin, in your armpits, or in your groin. Sarcoidosis can cause lumps, ulcers (sores), or areas of discolored skin. These areas may itch, but they don't hurt. These signs tend to appear on your back, arms, legs, and scalp.