Method and apparatus for tightening skin and other tissues

A kit for treating tissue and for use with an electromagnetic radiation source, the kit comprising:

• a needle sized to create puncture holes in the tissue;
• and
• a photochemical agent configured to penetrate through the puncture holes when applied to the tissue and to be activated to cause crosslinking of proteins in the tissue when irradiated with a predetermined electromagnetic radiation by the electromagnetic radiation source following a predetermined time period,
• wherein the predetermined electromagnetic radiation is at a wavelength that activates the photochemical agent, causing a protein response that brings fibers through a depth of the tissue closer together in order to one of reduce tissue laxity and tighten the tissue,
• wherein the predetermined time is selected to enable the photochemical agent to penetrate the depth of the tissue and become distributed adjacent proteins within the tissue,
• wherein the predetermined time period is between about thirty seconds to about five minutes, and
• wherein the needle is part of a needle array comprising:
• a head with internal needles extendable from a surface of the head by a button, the head configured to be coupled to a separate handle, wherein the needle is configured to simultaneously inject the photochemical agent through the needle while being pulled from the tissue so that the photochemical agent penetrates a depth of the tissue.