As a radiologist, I have witnessed the rapid expansion of ultrasonography in dermatologic practice over the last decade. In addition to the applications mentioned in the article, I would like to highlight some other important uses of dermatologic ultrasonography that further underscore its value in dermatologic practice.

Cellulitis is a bacterial infection of the skin and subcutaneous tissue, commonly caused by Staphylococcus aureus and Streptococcus pyogenes. Ultrasonography can show diffuse thickening of the dermis and subcutaneous tissue, with increased echogenicity and a "cobblestone" appearance. Color Doppler may reveal increased blood flow in the affected area [2].

Lipomas are benign fatty tumors that present as soft, mobile, and painless masses. Ultrasonography can show a well-defined, oval, or round hyperechoic mass, with fine internal echoes and posterior acoustic enhancement. Lipomas are typically homogeneous and compressible [3].

Abscesses are collections of pus within a confined space, usually caused by bacterial infection. Ultrasonography can display an irregular, hypoechoic or anechoic mass with variable echogenic debris, surrounded by a hyperechoic rim. Color Doppler may reveal increased peripheral vascularity [4].

Hematomas are localized collections of blood outside blood vessels, caused by trauma or coagulopathy. Ultrasonography can reveal a hypoechoic or heterogeneous mass, which may become more hyperechoic and organized over time as the blood clots. They can mimic superficial soft tissue tumors [5].

Lymphedema is swelling caused by a blockage in the lymphatic system, leading to an accumulation of lymphatic fluid. Ultrasonography can show thickening and increased echogenicity of the subcutaneous tissue, with a honeycomb pattern. Dilated lymphatic channels may also be observed [6].

Foreign bodies are objects or substances lodged within the skin or subcutaneous tissue, often as a result of trauma or injury. Ultrasonography can help visualize foreign bodies such as wood, glass, or metal, which appear as hyperechoic structures with posterior acoustic shadowing. Surrounding inflammation and possible abscess formation may also be observed [7].

Scabies is a contagious skin infestation caused by the mite Sarcoptes scabiei. High-resolution ultrasonography can help identify the mites as hyperechoic, millimetric structures within the epidermis, and their burrows as linear or curvilinear hypoechoic tracks in the stratum corneum [8].

Warts are benign skin growths caused by human papillomavirus infection. Ultrasonography can display warts as a hypoechoic or heterogeneous mass, with irregular thickening of the epidermis and dermis, and increased vascularity on Doppler examination [9].

Psoriasis is a chronic autoimmune skin condition characterized by red, scaly plaques. Ultrasonography can show thickening of the epidermis, increased dermal echogenicity, and a prominent hypoechoic band representing the inflammation within the dermis. Color Doppler may show increased blood flow in the affected area [10].

In conclusion, dermatologic ultrasonography is a valuable tool for managing skin conditions.