Correct Answer - C
Ans. C. Popliteal fossa

Sites of itching patch in atopic dermatitis Infant; Face (especially cheek), extensors offorearm& legs.
Childhood & adult > Flexures (antecubitalrbitalfoxa,Poplitealfossa).

@dermatology_vid

Correct Answer - A
Ans.A. Keratinocyte
Tzank cells are acanthoylytic cells i.e. large rounded keratinocytes
with relatively large nucleus with condensed or hazy cytoplasm.

@dermatology_vid

Ans. A.Cold temperature

Cutis marmorata is a condition where in the skin has a pinkish blue mottled or marbled appearance when subjected to cold temperatures.

It is seen throughout infancy and in 50 % of children.
Rewarming restores the skin to normal.
It is caused by superficial small blood vessels in the skin dilating and contracting at the same time .

@dermatology_vid

Correct Answer - B
Ans. B. Acanthosis
[Ref Rook's 7th/e p. 7.36]

Important terminology related to epidermal layers Separation of keratinocytes due to loss of intracellular bridges - Acantholysis
Intracellular edema of keratinocytes Ballooning

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Correct Answer - C
Ans. C. Post inflammatory hypomelanosis
[Ref IADVL 3"1/e p. 747-748]

Among given options, postinflammatory hypomelanosis is the best answer.

understand let us have a look at the definition few important terms.
Vitiligo is also an acquired condition with loss of pigmentation but most cases are idiopathic.
It is mainly considered to be an autoimmune condition.
Precipitated by hormonal changes, acute emotional trauma or stress
or any condition leading to immune imbalance.

So, any hypomelanosis resulting after inflammation is known as post inflammatory hypomelanosis (including leucoderma).

Sometimes both the terms are used synonymously.

Whereas the term 'chemical leucoderma' is used only when there repeated exposure (contact) to some specific chemical.

Therefore among given options, postinflammatory hypomelanosis is the best answer as drug reaction is an inflammatory condition
leading to residual hypopigmentatio


@dermatology_vid

Correct Answer - B
Ans. B. Reverse Koebner's phenomenon
[Refhttps://www.researchgate.net/publication/268343496_Proposed_
classification_for_koebner_wolf
isotopic_renbok_koebner_nonreaction_isotopic_nonreaction_other_relatedphenomen]

Annular orange skin lesions in a diabetic indicate towards granuloma annulare.

There have been few reports of disappearance of lesions after
biopsy in granuloma annulare.

This phenomenon is known as reverse Koebner's phenomenon.


@dermatology_vid

Correct Answer - A
Ans. A. Penicillamine
Drugs causing pemphigus

Penicillamine
Penicillins and Cefalosporins
Captopril,
Iodine,
Lithium
Phenophthelin,
Propanolol
Rifampicine
Phenytoin,
Phenylbutazone,
Salicylates,
Piroxicam,
Sulphonamides

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Correct Answer - A
Ans. is 'a' i.e., Hydroquinone

Skin depigmenting agents in clinical use are
Hydroquinone - most effective and widely used
Kojic acid
Kojicdipalmitate
Azelaic acid

@dermatology_vid

Correct Answer - C
Ans. is 'c' i.e., Clubbing

Clinical indicators of clubbing are

Lovibond profile sign and
curth's modified profile sign".

Lovibond angle is the angle located at the junction between the nail
plate and proximal nail fold. It is normally less than 160°.

In clubbing, the angle exceeds 180° (Lovibond profile sign).

@dermatology_vid

Correct Answer - C
Pemphigus vulgaris is an intraepidermal blistering disease.

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