The investigators will obtain human skin specimen (sized approximately 1 cm x 1 cm) for dermatological surgical patients in National Taiwan University Hospital, after informed consent was obtained. Human skin keratinocytes, fibroblasts, and melanocytes will be cultured from the human skin specimen. The three dimensional images of these cultured cells will be observed by a ultra-high resolution 3-dimensional optical coherence tomography.

The investigators will obtain human skin specimen (sized approximately 1 cm x 1 cm) for dermatological surgical patients in National Taiwan University Hospital, after informed consent was obtained. Human skin keratinocytes, fibroblasts, and melanocytes will be cultured from the human skin specimen. The three dimensional images of these cultured cells will be observed by a ultra-high resolution 3-dimensional optical coherence tomography.

Inclusion Criteria:

• Aged between 20 to 100.
• People who received benign skin tumor removal in dermatological surgical unit. OR
• People who received skin grafts (full thickness or split thickness) for reconstruction of surgical wounds after removing malignant skin cancer.

Exclusion Criteria:

• Age less than 20 years old,
• Psychiatric patients,
• Pregnant women.

Aged between 20 to 100. People who received benign skin tumor removal in dermatological surgical unit. OR people who received skin grafts (full thickness or split thickness) for reconstruction of surgical wounds after removing malignant skin cancer.