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Laser Hair Removal
A little (with the latest cryo-anaesthesia)
People who are prone to allergy (those with allergic rhinitis, asthma or urticaria) rarely can present with urticarial reaction to laser lights too. These usually goes away after treatment in a few hours.

Those with sensitive skin are not allergic, and will not run into this problem.
Occasionally under a combination of situations the resultant energy could be slightly excessive leading to small blister formation. Avoid bursting them and keep the skin involved clean, then there will be no blemish once healed.

Going under laser treatment after strong sunlight exposure is prone to over burn of the skin.
Thinner or lighter colored hair will require more treatments in general.