Contact dermatitis and chronic venous insufficiency.

Something which is a common problem is the contact dermatitis developing on venous insufficiency lower leg, mainly because of different products applied before, so there are several ingredients you have to be sure to avoid which are known to be very critical for developing allergic contra-dermatitis, one is lanolin, so any moisturizers including lanolin has to be avoided in patients with venous insufficiency. But also other products, so something you could do is a test for allergic reaction which is called patch testing, is the application of of common substances, potential for allergic contact dermatitis, you apply some small product on the back of the patient in an occlusive way with some aluminum disk and leave it for 48 hours and then remove it. and you're going to check if there is a team, vesicles or major problem. Those allergic products are numerated so you can check which one is creating and that's a way to avoid further problem.