Constipation usually goes hand in hand with adrenal fatigue (and hypothyroidism). When the colon doesn't release what it needs to in a timely fashion, other excretory organs (skin, mouth, lungs, etc.) take on the brunt of detoxification. Lung conditions develop, skin rashes appear, mouth sores, etc. So it is perfectly logical that you would find acne, psoriasis, eczema, etc. in a person with adrenal fatigue if they have concomitant constipation.