Seborrheic keratosis
Seborrheic keratosis is a non-cancerous benign skin tumour that originates from cells in the outer layer of the skin. Like solar lentigo, seborrheic keratoses are seen more often as people age.

The lesions of seborrheic keratosis appear in various colors, from light tan to black. They are round or oval, feel flat or slightly elevated, like the scab from a healing wound, and range in size from very small to more than 2.5 centimetres (1 in) across.

Darkly pigmented lesions can be challenging to distinguish from nodular melanomas. Furthermore, thin seborrheic keratoses on facial skin can be very difficult to differentiate from lentigo maligna even with dermatoscopy. Clinically, epidermal nevi are similar to seborrheic keratoses in appearance. Epidermal nevi are usually present at or near birth. Condylomas and warts can clinically resemble seborrheic keratoses. On the penis and genital skin, condylomas and seborrheic keratoses can be difficult to differentiate.

Seborrheic keratosis is the most common benign skin tumor. In large-cohort studies, 100% of the patients over age 50 had at least one seborrheic keratosis. Onset is usually in middle age, although they are also common in younger patients as like they are found in 12% of 15-year-olds to 25-year-olds.

In general, the lesion can be removed by laser surgery without leaving hyperpigmentation.
#QS532 laser
#Er:YAG laser
#CO2 laser
  • Multiple Seborrheic keratosis on the dorsum of a patient.
  • Typical Seborrheic keratosis
  • This is an atypical case. In this case, a malignant disorder such as squamous cell carcinoma should be suspected.
  • It is a benign tumor that is common in Asians. When warts or squamous cell carcinoma are suspected, a biopsy is sometimes performed.
  • Typical Seborrheic keratosis
  • This lesion resembles a wart.
References Seborrheic Keratosis 31424869 
Seborrheic keratoses are epidermal skin tumors that commonly present in adult and elderly patients. They are benign skin lesions and often do not require treatment. Laser therapy is non-surgical option for patients in the treatment of seborrheic keratosis. Ablative laser therapy includes (YAG and CO2 lasers), and non-ablative lasers (755 nm alexandrite laser) have been utilized for this purpose.
 Benign Eyelid Lesions 35881760 
The most common benign inflammatory lesions include chalazion and pyogenic granuloma. Infectious lesions include verruca vulgaris, molluscum contagiosum, and hordeolum. Benign neoplastic lesions include squamous cell papilloma, epidermal inclusion cyst, dermoid/epidermoid cyst, acquired melanocytic nevus, seborrheic keratosis, hidrocystoma, cyst of Zeiss, and xanthelasma.