1. The use of a probiotic bacterium or its lysate in a method of treatment, where the probiotic bacterium is a strain of Lactobacillus rhamnosus, a strain of Lactobacillus reuteri or a strain of Bifidobacterium longum. 2. The use of a probiotic bacterium or its lysate in a treatment method according to claim 1, wherein the treatment method includes the restoration or regeneration of the skin barrier. The use of a probiotic bacterium or its lysate in the treatment method according to claim 1, wherein the probiotic bacterium is Lactobacillus rhamnosus GG. 4. The use of a probiotic bacterium or its lysate in a method of treatment according to any one of claims. 1-3, where the probiotic bacterium is intended for use in the restoration or regeneration of the skin after a lesion. 5. The use of a probiotic bacterium or its lysate in a method of treatment according to any one of claims. 1-3, where the method is intended for wound healing, treatment of burns, psoriasis, ichthyosis, dermatitis, acne (including Hiradenitis Suppurativa), diaper rash, Netherton syndrome, actinic keratosis, dermatomycosis, dermatosis or ectoderm dysplasia. 6. The use of a probiotic bacterium or its lysate in a method of treatment according to any one of claims. 1-3, where the method of treatment includes the introduction of a probiotic bacterium or its lysate into the skin of the patient being treated. The use of a probiotic bacterium or its lysate in a method of treatment according to claim 1, wherein the probiotic bacterium is Lactobacillus rhamnosus GG, and the method of treatment comprises treating or preventing infection. The use of a probiotic bacterium or its lysate in a method of treatment according to claim 7, wherein the infection is a bacterial infection. The use of a probiotic bacterium or its lysate in the method of treatment according to claim 7, wherein the bacterial infection is a staphylococcal infection, preferably an infection of Staphylococcus aureus. 10. Probiotic Application
