LEP and acne: Conclusions from the influence of this PD on other markers (i.e., net acid excretion, CRP, selected hormones, e.g., leptin and cortisol, and indicators analyzed in multiple sclerosis and other diseases, e.g., acne) [29,72,73,74] and the long-term use of PD must be interpreted with caution, as they concern single or several studies.