Mushroom electrode is primarily used to provide a more diffused, gentle electrical stimulation across a larger area of skin, promoting blood flow enhancing cell regeneration and healing, making it beneficial for treating acne, reducing inflammation, promoting skin healing, and rejuvenating the overall appearance of the face, particularly around areas like the cheeks and forehead due to its wider surface area compared to other electrodes. 
Some users report that regular violet ray treatments with a mushroom electrode can help to tighten and tone the skin by stimulating collagen production.