Effects of non-polarized near-infrared ray irradiation on pressure pain threshold, tactile perception threshold and temporal summation were examined. The subjects were 10 healthy adults. All subjects were participated in both irradiation and control groups. The irradiation group, non-polarized near-infrared rays were applied to thenar eminence of non-dominant hand. The control group was not irradiated. Pressure pain threshold, tactile perception threshold and temporal summation were measured before and after irradiation. The pressure pain threshold value showed a significant increase after non-polarized near-infrared ray irradiation in the irradiation group, but the tactile perception threshold and visual analogue scale value reflecting the temporal summation did not change in the both groups. It was suggested that non-polarized near-infrared ray irradiation increased the pressure pain threshold. On the other hand, it was considered that non-polarized near-infrared ray irradiation does not affect the tactile perception threshold and the temporal summation.
Infantile hemangioma (IH) is a self-resolving tumor. However, some patients with IH require revision surgery due to the presence of residual lesions after regression. Our clinical therapeutic strategy for IH involves aggressive interventions using a long pulsed dye laser (595 nm) (including a cooling device with a variable pulse width) to reduce redness, oral propranolol administration, or a combination of both methods. The early intervention strategy used at our clinic eliminates the plaque- and mass-type IH in children aged less than 1 and 2 years, respectively. Beginning treatment at an early stage of IH seems to be important to suppress the growth of the tumor.
About 3 decades have passed since the pulsed-dye laser for the treatment of capillary malformation (port-wine stain) has spread. At present, the long-pulsed pulse dye laser has become the first-choice treatment in Japan. Devices with less purpura formation have been available in recent years. Early irradiation for infants tends to be recommended, but redarkening is still a serious problem. The development of the adjunctive drug or therapy which raise the effect of the dye laser is expected
Nevus of Ota is a bluish pigmentation on the face that usually occurs in children at a young age (<1 year) or at puberty. Using Q-switched lasers can effectively trat it; however, the treatment for children is known to be better than that for adults. The skin characteristics of children are different from those of adults. When treating nevus of Ota in children, it is important to consider body growth and mental development that occurs during childhood. This study gives a comprehensive description on laser treatment of nevus of Ota in children.
Although Mongolian spots and ectopic Mongolian spots typically lighten spontaneously, they occasionally persist to adulthood. They can be effectively treated with the Q-switched laser (ruby, alexandrite, Nd:YAG) especially in early childhood. However, complications such as hyperpigmentation and hypopigmentation often occur with laser treatment of Mongolian spots and ectopic Mongolian spots. Therefore, we should take special care to prevent long-term complications.