Dermatology is the science responsible for the study of the skin, mucous membranes (oral and genital) and cutaneous appendages, while dermatopathology focuses on its microscopic study. Although the two fields are closely related, in many cases the identification of dermatological diseases is mainly clinical and depends on the physician's ability and experience.

The purpose of this atlas, which collects over 900 clinical and histological photographs in high resolution, is to illustrate and describe the most frequent skin diseases on the basis of clinical cases. Offering a complete guide to the etiology, epidemiology, clinical features, histologic findings and diagnosis of the main skin diseases divided into three subgroups (inflammatory, infectious, or tumoral), it represents an invaluable resource for all medical students, residents, clinicians, and investigators learning dermatology.

Adriana Motta, MD

Dr. Motta is a dermatologist, professor and director of the dermatology program at the Universidad El Bosque, Bogotá, Colombia and chief of the dermatology department at Simón Bolivar Hospital, with a master's degree in Higher Education. She is also a member of the Colombian Association of Dermatology and has more than 20 international and 10 national publications to her credit.

Luis Fernando González, MD

Dr. Luis Fernando Gonzalez trained at Los Andes University School of Medicine and completed his residency in dermatology at the Universidad El Bosque. He has authored several articles on clinical and surgical dermatology. Dr González is a member of the Colombian Association of Dermatology and Surgical Dermatology and the International Society of Dermatology. With expertise in clinical, surgical and aesthetic dermatology, he is currently engaged in private practice full time. 

Gonzalo García, MD

Dr. García is a dermatologist, professor and coordinator of the dermatology program at the Universidad El Bosque, Bogotá, Colombia, with master's degrees in Higher Education and Marketing. Member of the Colombian Association of Dermatology and the American Academy of Dermatology.

Jennifer Guzmán, MD

Dr. Guzman received her dermatology degree from the Universidad El Bosque, Bogotá, Colombia in 2017, with a thesis on The virtual Atlas of Dermatology: a tool for the learning of inflammatory, infectious and neoplasms skin diseases.

She subsequently completed a 3-month observership in pediatric dermatology at the Hospital de Sant Pau in Barcelona, Spain. She is an active member of the Colombian Association of Dermatology and Surgical Dermatology, and member of the Ibero-Latin American College of Dermatology (CILAD). She is currently working as a clinical and surgical dermatologist for children and adults in the city of Medellin, Colombia. 

Lorena Prada, MD

Dr. Lorena Prada is a Colombian, board-certified dermatologist and a published author. She completed her medical degree at the Universidad Industrial de Santander in 2011, and her dermatology training in 2017. She received a merit award for her dissertation from the Universidad El Bosque. Dr Prada has presented papers nationally and was the recipient of a number of prizes at national dermatology meetings. Dr. Prada has a private practice in Bogotá. She regularly attends national and international conferences, courses and workshops.

Hugo Herrera, MD

Dr. Herrera is dermatologist, and completed his board certifications in dermatology in 1997. An active member of the Colombian Association of Dermatology and Surgical Dermatology, he has authored or co-authored several articles on dermatology and evidence-based guidelines for the management of skin cancer in Colombia. In addition, he teaches dermatology at the Universidad El Bosque, Bogotá, Colombia.

Mariam Rolón, MD

In addition, Dr. Rolón has authored or co-authored several articles on dermatology and evidence-based guidelines for the management of skin cancer. She currently teaches dermatopathology courses at the Universidad El Bosque, Bogotá, Colombia and at Los Andes University/ Fundacion Santa Fé University Hospital, Colombia.

I.    INFLAMMATORY SKIN DISEASES

Chapter 1. Papulosquamous and eczematous dermatoses

1. Dermatitis or eczema

a. Contact dermatitis

i. Allergic contact dermatitis

ii. Irritant contact dermatitis

b. Atopic dermatitis

c. Aesteatotic dermatitis

d. Nummular dermatitis

e. Gravitational Dermatitis

f. Seborrheic dermatitis

g. Palmoplantar vesicular dermatitis

i. Ponfólix

ii. Chronic vesicle-bullous dermatitis of the hands

iii. Hyperkeratotic dermatitis of the hand

iv. Ide reaction

h. Autosensitization dermatitis

i. Herpetic eczema or varicelliform eruption of Kaposi

j. Infectious dermatitis

k. Chronic simple liquor

l. Nodular prurigo

m. Plantar Juvenile Dermatosis

2. Psoriasis

a. Psoriasis vulgaris or plaques

b. Guttate Psoriasis

c. Pustular psoriasis

i. Located

1. Palmoplantar Pustulosis

2. Continuous acrodermatitis of Hallopau

ii. Generalized

1. Acute generalized pustulose (von Zumbusch)

2. Annular pustular

d. Inverse psoriasis

e. Scalp Psoriasis

f. Genital Psoriasis

g. Erythrodermic psoriasis

h. Nail Psoriasis

i. Psoriatic arthropathy

j. HIV-associated psoriasis 

3. Lichen and lichenoid reactions

a. Lichen planus

i. Lichen planus pillar

ii. Oral lichen planus

iii. Actinic lichen planus

iv. Lichen planus pigmentosa

v. Acute exanthematic flat lichen

vi. Lichen inverse plane

vii. Genital lichen planus

viii. Hypertrophic lichen planus

ix. Bullous or pemphigid lichen planus

x. Annular lichen planus

xi. Linear lichen planus

xii. Ungular lichen planus

xiii. Ulcerative lichen planus

b. Lichenoid reaction

c. Fixed pigmented erythema

d. Lichen Crisp

e. Lichen striatum

f. Persistent dyschromic erythema

g. Chronic Lichenoid Keratosis 

Chapter 2. Other Papular, erythematous and scaly diseases

Chapter 3. Inflammatory diseases of pilose follicle

1. Alopecia