Brief Answer: Sarcoidosis not transmissible Detailed Answer: Dear XXXXXXX Thanks for your query. Sarcoidosis is not contagious, and therefore cannot be passed from person to person. It is probably auto-iimune in origin. It is difficult to know exactly the reason for your rash in the legs without examining it directly; at times, even scrapings from lesions may be needed to see if it is perhaps an infection; diabetes indeed puts you at higher risk for infections, including fungal A skin specialist (Dermatologist) could be your initial encounter Hope this helps, wish you the best, Dr Brenes-Salazar MD Mayo Clinic MN

---