1. The use of L-serine as a medicine for the prevention and / or treatment of an inflammatory skin reaction caused by overexpression and / or hyperactivation of PAR2.2. A pharmaceutical composition containing L-serine for use as a medicament for the prevention and / or treatment of an inflammatory skin reaction caused by overexpression and / or hyperactivation of PAR2.3. The composition of claim 2, further comprising Avène thermal water. 4. The composition of claim 2, further comprising glycerol. 5. The composition of claim 3, further comprising glycerol. 6. The composition according to claim 2, characterized in that L-serine is the only active agent of the composition. The composition according to claim 2, characterized in that the skin inflammatory reaction caused by overexpression and / or hyperactivation of PAR2 receptors causes an inflammatory skin pathology selected from the group comprising atopic dermatitis, lichen planus, psoriasis, pruritus, seborrheic dermatitis, rosacea, rosacea and skin hypersensitivity. 8. The composition according to claim 3, characterized in that the skin inflammatory reaction caused by overexpression and / or hyperactivation of PAR2 receptors causes an inflammatory pathology of the skin selected from the group comprising atopic dermatitis, lichen planus, psoriasis, pruritus, seborrheic dermatitis, rosacea, rosacea and skin hypersensitivity. 9. The composition according to claim 4, characterized in that the skin inflammatory reaction caused by overexpression and / or hyperactivation of PAR2 receptors causes an inflammatory pathology of the skin selected from the group comprising atopic dermatitis, lichen planus, psoriasis, pruritus, seborrhea1. Применение L-серина в качестве лекарственного средства для предупреждения и/или лечения воспалительной реакции кожи, вызванной гиперэкспрессией и/или гиперактивацией PAR2.2. Фармацевтическая композиция, содержащая L-серин, для применения в качестве лекарственного средства для предупреждения и/
