Yes, they can!
Drinking water and using cool compress towels on infected areas puts moisture into the area, often repairing the enzymatic function of the skin especially in mild cases. Manuka honey-based products are natural humectants holding up to 10 times their weight in water. This will certainly help and restores the skin's microbiome and strengthens the skin's barrier function.
Ongoing psoriasis that is severe should be treated by a doctor and managed with a very careful diet.
Some Information on Psoriasis:
Psoriasis is a complex skin disorder. Simply put, it is when our normal enzymatic function is disrupted and therefore turnover of cells is compromised (this is called desquamation).
Sticky cells, normally associated with a dry scalp, prevent normal shedding, so chunks of condensed cells fall away and the new, underdeveloped skin repeats in a mimicking way – untreated it can be quite debilitating. Psoriasis is often associated with chromosome issues, nervous disorders, red hair gene and rosacea. It's normally found on the head/scalp/ears/neck.