Could the recurring vesicles (blisters) be caused by underlying, lingering sinusitis? If the sinus inflammation causes the lymphatic drainage to become obstructed, the interstitial fluid has nowhere to go. This buildup of pressure might force the lymph fluid out through the skin, where it dries into yellow crusts (serous exudate)." Do al the People in the forum has sinus problems or postnasale drip. Chatgpt say thats my problem