The invention relates to a pharmaceutical composition consisting of 
snail slime of 
Helix aspersa muller (Cryptophalus aspersus) (5% to 50%), 
chamomile extract (5% to 10%), honey (5% to 10%), and additives and / or pharmaceutically accepted excipients to form a formulation having low, intermediate or high 
viscosity (1 to 1000 Pa·s). By dipping a patch or 
bandage of gauzy fabric into the composition in the form of a 
lotion, 
shampoo, 
soap, cream or gel, the composition is applied on lesions caused by 
psoriasis. The composition can also contain natural extracts, such as 
marigold extract, 
propolis, and vegetable oils. The invention also claims a method for obtaining the composition and the use thereof to prepare a 
drug or device for preventing, treating or curing 
psoriasis lesions on the head, the 
skin of the body or of the face.