Erythema nodosum and strep infection

Erythema nodosum is an inflammatory reaction that causes tender, red or dusky lumps, often on the shins. A throat infection caused by streptococcal bacteria is one possible trigger. The skin reaction may appear after the throat symptoms have eased, so tell the clinician about any recent sore throat, fever, swollen neck glands, or contact with someone who was ill.

The lumps are not the same as an infection inside the skin. Their appearance alone cannot confirm strep or identify the underlying trigger; other infections, medicines, and inflammatory conditions can produce a similar pattern.

Arrange a medical assessment if new tender shin lumps are appearing or walking is uncomfortable. The clinician may examine your throat and skin and choose a throat swab or other test based on your symptoms and timing. Do not start leftover antibiotics. If strep is confirmed, take the prescribed course exactly as directed; antibiotics treat the bacterial infection, not every cause of erythema nodosum.

Resting the legs, elevating them, and using a cool compress may reduce discomfort. Ask before taking an anti-inflammatory medicine, particularly if you have stomach, kidney, bleeding, pregnancy, or medicine-related concerns.

Seek prompt care for trouble breathing or swallowing, rapidly worsening throat swelling, severe weakness, or a high fever. Contact a clinician soon if the redness spreads quickly, one leg becomes markedly more swollen than the other, or pain prevents normal walking. These features need assessment rather than an assumption that strep explains the skin changes.

Could a recent throat infection be relevant, and do I need a strep test? What other triggers fit my examination? Which pain-relief options are suitable for me? What changes should prompt a follow-up visit?