Common Purslane: aka duckweed, fatweed, pursley, pussley, verdolagas and wild portulaca is known to cure lichen planus according to my dentist.
Personally I have been looking for this plant and will find it.
grown in wild is better than domesticated
Purslane may be a common plant, but it is uncommonly good for you. It tops the list of plants high in vitamin E and an essential omega-3 fatty acid called alpha-linolenic acid (ALA). Purslane provides six times more vitamin E than spinach and seven times more beta carotene than carrots. It's also rich in vitamin C, magnesium, riboflavin, potassium and phosphorus.
Omega-3s are a class of polyunsaturated essential fatty acids. Your body cannot manufacture essential fatty acids, so you must get them from food. Unfortunately, the typical American diet contains too few omega-3s, a shortage that is linked to a barrage of illnesses including heart disease, cancer and Alzheimer's disease.