Unusual Rash Beneath the Knee?
A 40-year-old man, standing at 5 feet 11 inches and weighing 200 pounds, residing in the suburbs of New York City, noticed an unfamiliar mark under his knee last Wednesday. Initially, he assumed it was a bug bite. However, he observed that the area began to spread over the next couple of days and decided to consult his primary care physician. Upon examination, the physician noted the rash's linear appearance and suggested it might be poison ivy, subsequently recommending a topical steroid cream. Two days later, the rash showed further expansion and was accompanied by a sense of malaise, resembling feverish symptoms, although he did not develop an actual fever. The discomfort was somewhat alleviated with Advil. Concerned about a potential infection, his doctor also prescribed an antibiotic. While he has included some images for reference, he remains doubtful regarding the poison ivy diagnosis, particularly since the rash has not itched and was only slightly tender at most. Any insights from medical professionals on Reddit would be greatly appreciated!
Answers (1)
6/30/2025, 12:20:51 PM
OpenHealth AI
It sounds like you’re dealing with a concerning rash that is not responding as expected. The initial assessment by your physician suggested poison ivy, but the expansion of the rash and your accompanying symptoms are indeed warranting further investigation.
Main Points:
- The rash under your knee is unusual, expanding, and accompanied by malaise.
- It may not be poison ivy since it is not itchy.
- Ongoing monitoring and proactive measures are essential.
Explanation:
Rashes can have many causes, including allergic reactions, infections, or other dermatological conditions. Poison ivy typically presents with intense itching and is usually contained, while your description suggests a different underlying issue. The malaise and linear appearance of the rash, coupled with the lack of itching, lead us to consider possibilities such as:
- Infection: If the rash is spreading, it might indicate an infection rather than an allergic reaction.
- Erythema multiforme: A skin reaction that can occur due to various triggers, including infections or medications.
- Other dermatoses: Conditions such as contact dermatitis, fungal infections, or even autoimmune skin conditions could be responsible.
Next Steps:
- Continue Monitoring: Keep an eye on the rash for any changes, such as increased size, pain, or spreading.
- Photodocument Progress: Take daily photos to track the rash's progression and any new symptoms you may experience.
- Symptom Management: Continue using the topical steroid cream as advised, and take over-the-counter pain relief like Advil as needed.
- Consider Allergens & Irritants: Think about any recent exposure to new products, plants, or substances that could have caused a reaction.
- Follow Up: If the rash continues to spread or you develop more severe symptoms (like high fever, significant swelling, or signs of infection such as pus), consider a follow-up appointment with your physician or a dermatologist for a thorough evaluation.
Since you feel uncertain about the diagnosis, it's important that any new or worsening symptoms prompt you to seek further medical advice. Taking these steps will help you gain clarity and ensure you receive appropriate care. Let me know if you need further information or support!
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