The first type of side effects are called temporary side effects. They are not severe and they disappear up to a few days. They most often include swelling and redness of the skin and can be softened by using special creams. During the procedure you can also experience pain, but this can also be eased by using anesthetics.
There are however more risky side effects of laser hair removal and they can be permanent. They include for example burns. They can happen if a less qualified technician performs the procedure, but it is highly advised to consult a doctor first to find out if you are the right person for undergoing this kind of method. It is also agreed that people with darker skin complexion are more liable to suffer from burns. The reason is that their pigments are less resistant to the action of the laser.
Hyperpigmentation and hypopigmentation are a different kind of permanent side effects. They both concern the alternation in skin tone. The first one refers to the darkening of the skin, the second one to the lightening of the skin. What is responsible for this, is the production of melanin, which can be bigger because of the action of the laser or in some cases may be impeded, leading to the loss of skin pigment.
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It is true that there exist some laser hair removal side effects, but it is all up to you which method you want to choose. A permanent effect is definitely satisfying and many people choose this way of hair removal, not being concerned with its after effects.