Hyperkeratosis is a skin condition caused by thickening of the horny layer.
Hyperkeratosis has many different types. Some are dangerous and some are completely harmful. I will focus on specific types of hyperkeratosis and see how dangerous or harmless they are.
Actinic keratosis is a type of hyperkeratosis. This type of keratosis is usually malignant. It can lead to skin cancer. The lesions are usually premalignant and you should be very alert. You should always see a dermatologist to certify whether you have this type of hyper keratosis so that you are easily helped. Actinic keratosis is usually characterized by appearance of thick and scaly patches on the skin. The patches are also scaly. All this is due to the thickening of the skin. Let a dermatologist examine you. The earlier it is discovered, the better for you.
Keratosis pilaris is a form of hyperkeratosis that that affects the arms, thighs and knees. This type of keratosis is also known as chicken skin. It usually has rough and bumpy appearances on the skin. These bumps appear on the legs, hands and arms. This type of hyperkeratosis does not affect the sole of the feet as the skin there is glabrous. This type of hyperkeratosis is not dangerous. It poses no health risk. The only problem it causes is cosmetic problems.
Ichthyosis is a type of hyper-keratosis too. The skin gets dry and scaly when you have this skin condition. There are mild forms of this kind of hyperkeratosis that is simply harmful. However, there is a form of this hyperkeratosis that is life threatening and you need to seek the advice of a dermatologist.
Seborrheic keratosis is also form of hyperkeratosis. It is harmless and you need not worry when you have it. It is not dangerous.
There are treatments for hyperkeratosis. At most times, tropical creams are used. These creams work by softening the affected skin. This happens as the creams hydrate the skin hence moisturizing it. Tretinoin works by shedding the thickened skin. With time, you are good to go. You can also use moisturizing lotions on the lesions. They will make them softer.
As I conclude, you cannot really say whether hyperkeratosis is dangerous or not. It all depends on the type of hyper keratosis you are suffering from. Some are dangerous while others are completely harmless. Talk to your dermatologist more to know exactly the severity of your skin condition.