### Why You Might Get a Rash on Your Penis and When to See a Doctor A rash on your penis can be alarming, but it's not uncommon. Here are some reasons why it might happen and when you should seek medical advice. #### Common Causes 1. **Balanitis**: Inflammation of the head of the penis, often seen in uncircumcised males. Symptoms include redness, swelling, and discharge. 2. **Contact Dermatitis**: An allergic reaction to soaps, detergents, or other chemicals. The rash appears shortly after exposure and can last up to a month. 3. **Medications**: Some drugs can cause rashes as a side effect. These rashes can be red, purple, or dark patches. 4. **Sexually Transmitted Diseases (STDs)**: Infections like scabies, syphilis, genital herpes, and genital warts can cause rashes. 5. **Yeast Infections**: Overgrowth of yeast can lead to a painful rash and redness. 6. **Lichen Planus**: A condition that can cause non-itchy rashes, sometimes turning into painful sores. 7. **Eczema**: Though rare on the genitals, eczema can cause itchy, red patches. #### When to See a Doctor - If the rash is accompanied by fever. - If you experience severe itching, pain, or swelling. - If the rash doesn't improve with over-the-counter treatments. - If you suspect it might be related to an STD. - If you have a weakened immune system. Always consult a healthcare provider for a proper diagnosis and treatment plan.