This liquid composition comprises between 0.5 and 1 millilitre of 70° ethyl alcohol for every 10 millilitres of an infusion of chamomile (Chamomilla recutita or Matricaria Chamomilla), naturally grown, without chemical fertilisers or pesticides, prepared with 1 gram of chamomile for every 0.2 litres of low-mineralisation mineral water. For a specific treatment against psoriasis, this composition further includes organic sweet almond oil in a quantity ranging between 3 and 6 millilitres for every 10 millilitres of chamomile infusion.