This kind of sometimes itchy pimple like things are coming in various

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This kind of sometimes itchy pimple like things are coming in various places in my body it is also seen in my mother and sister

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Based on the images you shared and what you've described, here's my read on this:

What I see: Small, skin-colored to slightly pink, pimple-like bumps that appear over various body sites (arm/upper thigh in your photos), with itchiness, and a family history in your mother and sister. That combination (chronic, itchy, small papules, running in the family) is a pretty classic pattern for a few conditions, most commonly:

Keratosis Pilaris (KP) - tiny rough, skin-colored/reddish bumps, often on upper arms, thighs, or cheeks, caused by keratin plugging hair follicles. Very commonly inherited (autosomal dominant tendency) - it's extremely common to see it run through a mother and siblings. Usually not very itchy but can be mildly so, especially when skin is dry.
Atopic dermatitis / eczema-related papules - if there's a strong family history of itching, allergies, asthma, or eczema, this is also a familial, itchy papular condition.
Papular urticaria or dermatographism - less likely to be a strict family pattern, but possible.
Lichen planus or a follicular eczema variant - if the bumps are more purplish/flat-topped, worth distinguishing.

Given the description (itchy, pimple-like, "various places," and familial), Keratosis Pilaris is the top possibility, especially if the bumps feel rough like sandpaper and are worse in dry weather/winter, and are concentrated on outer arms, thighs, or cheeks.

What would help distinguish:

Do the bumps feel rough/gritty to touch, or more like tender pimples?
Are they worse in winter/dry weather, or after sweating/heat?
Any history of eczema, asthma, or allergies in the family?
Do they ever have visible pus or crust, or stay dry and bumpy?

What you can do now (safe, general measures):

Use a gentle, fragrance-free moisturizer with urea, lactic acid, or salicylic acid (e.g., AmLactin, Eucerin roughness relief) - very effective for KP.
Avoid harsh soaps and hot showers, which dry the skin and worsen itching.
Avoid scratching/picking, which can cause secondary infection or dark marks (post-inflammatory hyperpigmentation), which is common in these familial bump conditions.
A mild antihistamine (like cetirizine) can help if itching is significant, but check with a pharmacist/doctor first, especially if you're on other medications.

When to see a dermatologist (in person):

If the bumps are spreading rapidly, becoming painful, oozing, or forming pus-filled heads
If they don't improve with moisturizing over 4-6 weeks
If you want a definitive diagnosis - a dermatologist can diagnose KP, eczema, or lichen planus just by looking and sometimes with a simple skin scrape, no invasive testing usually needed

I can't give you a certain diagnosis from photos alone since close-up single images without full body distribution make it hard to be 100% sure, but a dermatologist visit would give you a definitive answer and prescription-strength options if the over-the-counter moisturizers don't fully control it. Given the strong family pattern, this is very likely a benign, manageable, genetically-influenced skin condition rather than anything dangerous.

Not chronic I meant we all started getting it at same time

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multiple family members suddenly develop itchy bumps same time causes

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scabies burrow itchy papules arm hand

That detail changes things quite a bit. Simultaneous onset in you, your mother, and your sister points away from a genetic/inherited skin condition and toward something shared or transmitted within the household — either contagious, from a common environmental exposure, or from a shared source of bites.

Top possibility: Scabies

This is the single most important thing to rule out here. Textbook teaching is explicit on this exact pattern:

"When more than one member of the family has pruritus, scabies should be suspected." - Andrews' Diseases of the Skin

Scabies is caused by a microscopic mite (Sarcoptes scabiei) that spreads through close, prolonged skin contact (or shared bedding/clothing), which is exactly why it clusters in households - mother, sister, and you being affected around the same time fits this well. Key features that support or argue against it:

Itching that's worse at night - a hallmark of scabies
Tiny papules often clustered in finger webs, wrists, elbows, armpits, waistline, and groin - though it can appear on the trunk and limbs too
Sometimes thin, thread-like burrow lines are visible, not just isolated bumps
The bump in your second photo (small, slightly pink, discrete) is consistent with a scabetic papule, though a single photo can't confirm this

Other realistic possibilities given "all started at the same time"

Papular urticaria from insect/mite bites - if you all share a bed, sofa, or recently got new mattresses/furniture, or if there's a flea/mite source (pet, bedding) at home, this can cause simultaneous itchy bumps in multiple household members.
Contact dermatitis - a new shared soap, detergent, fabric softener, lotion, or even bedsheets could cause an allergic/irritant reaction across family members using the same products.
Heat rash (miliaria) if the onset coincided with a hot, sweaty period and the bumps are concentrated in covered/sweaty areas.
A viral exanthem is less likely if this is purely a localized itchy bump issue without fever or systemic symptoms, but worth mentioning if anyone was unwell around the same time.

What tips the balance toward scabies vs. the others

Ask yourself:

Is itching worse at night, disturbing sleep?
Are bumps present in finger webs, wrist creases, underarms, or waistline, not just isolated arm spots?
Has anyone recently had close contact with a new person, shared bedding, hostel/hospital stay, or lived in crowded conditions?
Did you get any new mattress, furniture, or pet around the time this started?

What to do

Given a family cluster of itchy papules starting simultaneously, this warrants an in-person dermatology visit relatively soon rather than waiting, for two reasons: scabies is easily confirmed (skin scraping or dermoscopy) and needs the entire household treated at the same time (typically permethrin cream applied to the whole body, repeated after a week, plus washing bedding/clothes in hot water) even if only some members show visible lesions - otherwise it just keeps bouncing between family members.

Please don't self-treat with random creams until it's evaluated, since steroid creams can actually mask and worsen scabies (a condition doctors call "scabies incognito"), making it harder to diagnose later.

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