Cornea is actually a clinical term for prickly heat, which occurs as a result of inflammation of the skin due to poor perspiration when the patient is in a humid, muggy environment for a long time. And milia is actually a small retained cyst of the epidermis associated with genetics, or damaged sweat ducts after inflammation. Prickly heat tends to occur in areas that tend to accumulate a lot of sweat, such as the underarms, neck, or skin folds, where it can appear as small, pinpoint-sized, densely distributed blisters, and may be accompanied by itching. However, corn rash tends to have a distinct distribution around the eyes and the patient will not feel anything, and if squeezed will squeeze out small keratinous plugs from it. In terms of treatment, prickly heat can be effectively removed with the application of prickly heat powder and stovepipe lotion, but milia need to be cured by applying local squeezing and picking out the white granular objects from them.